This theorem was first proved by Schoen-Yau [1]} in 1979 by constructing stable minimal surface. Later Schoen-Yau extended the theorem to the case when the dimension was less than eight [2]}, [3]}. In 1981, Witten [4]} later proved the positive mass theorem for spin manifolds of any dimension. In 2001, as a byproduct of the proof of the Penrose inequality, Huisken-Ilmanen [5]} proved the three dimensional positive mass theorem by using the inverse mean curvature flow. Recently, for three dimensional positive mass theorem, Li [6]} gave a proof using Ricci flow, Bray-Kazaras-Khuri-Stern [7]} gave a proof using a mass inequality.
